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Netty与SpringBoot的整合实现

​ 最近有朋友向我询问一些Netty与SpringBoot整合的相关问题，这里，我就总结了一下基本整合流程，也就是说，这篇文章 ，默认大家是对netty与Spring，SpringMVC的整合是没有什么问题的。现在，就进入正题吧。

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Server端：

总的来说，服务端还是比较简单的，自己一共写了三个核心类。分别是

  • NettyServerListener：服务启动监听器
  • ServerChannelHandlerAdapter：通道适配器，主要用于多线程共享
  • RequestDispatcher：请求分排器

下面开始集成过程：

在pom.xml中添加以下依赖


 io.netty
 netty-all
 5.0.0.Alpha2


 org.springframework.boot
 spring-boot-configuration-processor
 true

让SpringBoot的启动类实现CommandLineRunner接口并重写run方法,比如我的启动类是CloudApplication.java

@SpringBootApplication
public class CloudApplication implements CommandLineRunner {

 public static void main(String[] args) {
 SpringApplication.run(CloudApplication.class, args);
 }

 @Override
 public void run(String... strings) {
 }
}

创建类NettyServerListener.java

// 读取yml的一个配置类
import com.edu.hart.modules.constant.NettyConfig;
// Netty连接信息配置类
import com.edu.hart.modules.constant.NettyConstant;
// 
import com.edu.hart.rpc.util.ObjectCodec;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.PreDestroy;
import javax.annotation.Resource;

/**
 * 服务启动监听器
 *
 * @author 叶云轩
 */
@Component
public class NettyServerListener {
 /**
 * NettyServerListener 日志输出器
 *
 * @author 叶云轩 create by 2017/10/31 18:05
 */
 private static final Logger LOGGER = LoggerFactory.getLogger(NettyServerListener.class);
 /**
 * 创建bootstrap
 */
 ServerBootstrap serverBootstrap = new ServerBootstrap();
 /**
 * BOSS
 */
 EventLoopGroup boss = new NioEventLoopGroup();
 /**
 * Worker
 */
 EventLoopGroup work = new NioEventLoopGroup();
 /**
 * 通道适配器
 */
 @Resource
 private ServerChannelHandlerAdapter channelHandlerAdapter;
 /**
 * NETT服务器配置类
 */
 @Resource
 private NettyConfig nettyConfig;

 /**
 * 关闭服务器方法
 */
 @PreDestroy
 public void close() {
 LOGGER.info("关闭服务器....");
 //优雅退出
 boss.shutdownGracefully();
 work.shutdownGracefully();
 }

 /**
 * 开启及服务线程
 */
 public void start() {
 // 从配置文件中(application.yml)获取服务端监听端口号
 int port = nettyConfig.getPort();
 serverBootstrap.group(boss, work)
  .channel(NioServerSocketChannel.class)
  .option(ChannelOption.SO_BACKLOG, 100)
  .handler(new LoggingHandler(LogLevel.INFO));
 try {
  //设置事件处理
  serverBootstrap.childHandler(new ChannelInitializer() {
  @Override
  protected void initChannel(SocketChannel ch) throws Exception {
   ChannelPipeline pipeline = ch.pipeline();
   pipeline.addLast(new LengthFieldBasedFrameDecoder(nettyConfig.getMaxFrameLength()
    , 0, 2, 0, 2));
   pipeline.addLast(new LengthFieldPrepender(2));
   pipeline.addLast(new ObjectCodec());

   pipeline.addLast(channelHandlerAdapter);
  }
  });
  LOGGER.info("netty服务器在[{}]端口启动监听", port);
  ChannelFuture f = serverBootstrap.bind(port).sync();
  f.channel().closeFuture().sync();
 } catch (InterruptedException e) {
  LOGGER.info("[出现异常] 释放资源");
  boss.shutdownGracefully();
  work.shutdownGracefully();
 }
 }
}

创建类ServerChannelHandlerAdapter.java - 通道适配器

// 记录调用方法的元信息的类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

/**
 * 多线程共享
 */
@Component
@Sharable
public class ServerChannelHandlerAdapter extends ChannelHandlerAdapter {
 /**
 * 日志处理
 */
 private Logger logger = LoggerFactory.getLogger(ServerChannelHandlerAdapter.class);
 /**
 * 注入请求分排器
 */
 @Resource
 private RequestDispatcher dispatcher;

 @Override
 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
 cause.printStackTrace();
 ctx.close();
 }

 @Override
 public void channelRead(ChannelHandlerContext ctx, Object msg) {
 MethodInvokeMeta invokeMeta = (MethodInvokeMeta) msg;
 // 屏蔽toString()方法
 if (invokeMeta.getMethodName().endsWith("toString()")
  && !"class java.lang.String".equals(invokeMeta.getReturnType().toString()))
  logger.info("客户端传入参数 :{},返回值：{}",
   invokeMeta.getArgs(), invokeMeta.getReturnType());
 dispatcher.dispatcher(ctx, invokeMeta);
 }
}

RequestDispatcher.java

// 封装的返回信息枚举类
import com.edu.hart.modules.communicate.ResponseCodeEnum;
// 封装的返回信息实体类
import com.edu.hart.modules.communicate.ResponseResult;
// 封装的连接常量类
import com.edu.hart.modules.constant.NettyConstant;
// 记录元方法信息的实体类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
// 对于返回值为空的一个处理
import com.edu.hart.rpc.entity.NullWritable;
// 封装的返回信息实体工具类
import com.edu.hart.rpc.util.ResponseResultUtil;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 请求分排器
 */
@Component
public class RequestDispatcher implements ApplicationContextAware {
 private ExecutorService executorService = Executors.newFixedThreadPool(NettyConstant.getMaxThreads());
 private ApplicationContext app;

 /**
 * 发送
 *
 * @param ctx
 * @param invokeMeta
 */
 public void dispatcher(final ChannelHandlerContext ctx, final MethodInvokeMeta invokeMeta) {
 executorService.submit(() -> {
  ChannelFuture f = null;
  try {
  Class<?> interfaceClass = invokeMeta.getInterfaceClass();
  String name = invokeMeta.getMethodName();
  Object[] args = invokeMeta.getArgs();
  Class<?>[] parameterTypes = invokeMeta.getParameterTypes();
  Object targetObject = app.getBean(interfaceClass);
  Method method = targetObject.getClass().getMethod(name, parameterTypes);
  Object obj = method.invoke(targetObject, args);
  if (obj == null) {
   f = ctx.writeAndFlush(NullWritable.nullWritable());
  } else {
   f = ctx.writeAndFlush(obj);
  }
  f.addListener(ChannelFutureListener.CLOSE);
  } catch (Exception e) {
  ResponseResult error = ResponseResultUtil.error(ResponseCodeEnum.SERVER_ERROR);
  f = ctx.writeAndFlush(error);
  } finally {
  f.addListener(ChannelFutureListener.CLOSE);
  }
 });
 }

 /**
 * 加载当前application.xml
 *
 * @param ctx
 * @throws BeansException
 */
 public void setApplicationContext(ApplicationContext ctx) throws BeansException {
 this.app = ctx;
 }
}

application.yml文件中对于netty的一个配置

netty:
 port: 11111

NettyConfig.java

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * 读取yml配置文件中的信息
 * Created by 叶云轩 on 2017/10/31 - 18:38
 * Concat tdg_yyx@foxmail.com
 */
@Component
@ConfigurationProperties(prefix = "netty")
public class NettyConfig {

 private int port;

 public int getPort() {
 return port;
 }

 public void setPort(int port) {
 this.port = port;
 }
}

NettyConstanct.java

import org.springframework.stereotype.Component;

/**
 * Netty服务器常量
 * Created by 叶云轩 on 2017/10/31 - 17:47
 * Concat tdg_yyx@foxmail.com
 */
@Component
public class NettyConstant {

 /**
 * 最大线程量
 */
 private static final int MAX_THREADS = 1024;
 /**
 * 数据包最大长度
 */
 private static final int MAX_FRAME_LENGTH = 65535;

 public static int getMaxFrameLength() {
 return MAX_FRAME_LENGTH;
 }

 public static int getMaxThreads() {
 return MAX_THREADS;
 }
}

至此，netty服务端算是与SpringBoot整合成功。那么看一下启动情况吧。

Netty与Spring Boot的整合实现

Client端：

Client我感觉要比Server端要麻烦一点。这里还是先给出核心类吧。

  • NettyClient ： netty客户端
  • ClientChannelHandlerAdapter ： 客户端通道适配器
  • CustomChannelInitalizer：自定义通道初始化工具
  • RPCProxyFactoryBean：RPC通信代理工厂

在Client端里。SpringBoot的启动类要继承SpringBootServletInitializer这个类，并覆盖SpringApplicationBuilder方法

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class OaApplication extends SpringBootServletInitializer {

 public static void main(String[] args) {
 SpringApplication.run(OaApplication.class, args);
 }

 @Override
 protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
 return builder.sources(OaApplication.class);
 }
}

NettyClient.java

// 记录元方法信息的实体类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.management.MBeanServer;

/**
 * 客户端发送类
 * Created by 叶云轩 on 2017/6/16-16:58
 * Concat tdg_yyx@foxmail.com
 */
public class NettyClient {

 private Logger logger = LoggerFactory.getLogger(MBeanServer.class);
 private Bootstrap bootstrap;
 private EventLoopGroup worker;
 private int port;
 private String url;
 private int MAX_RETRY_TIMES = 10;

 public NettyClient(String url, int port) {
 this.url = url;
 this.port = port;
 bootstrap = new Bootstrap();
 worker = new NioEventLoopGroup();
 bootstrap.group(worker);
 bootstrap.channel(NioSocketChannel.class);
 }

 public void close() {
 logger.info("关闭资源");
 worker.shutdownGracefully();
 }

 public Object remoteCall(final MethodInvokeMeta cmd, int retry) {
 try {
  CustomChannelInitializerClient customChannelInitializer = new CustomChannelInitializerClient(cmd);
  bootstrap.handler(customChannelInitializer);
  ChannelFuture sync = bootstrap.connect(url, port).sync();
  sync.channel().closeFuture().sync();
  Object response = customChannelInitializer.getResponse();
  return response;
 } catch (InterruptedException e) {
  retry++;
  if (retry > MAX_RETRY_TIMES) {
  throw new RuntimeException("调用Wrong");
  } else {
  try {
   Thread.sleep(100);
  } catch (InterruptedException e1) {
   e1.printStackTrace();
  }
  logger.info("第{}次尝试....失败", retry);
  return remoteCall(cmd, retry);
  }
 }
 }
}

ClientChannelHandlerAdapter.java

import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by 叶云轩 on 2017/6/16-17:03
 * Concat tdg_yyx@foxmail.com
 */
public class ClientChannelHandlerAdapter extends ChannelHandlerAdapter {
 private Logger logger = LoggerFactory.getLogger(ClientChannelHandlerAdapter.class);
 private MethodInvokeMeta methodInvokeMeta;
 private CustomChannelInitializerClient channelInitializerClient;

 public ClientChannelHandlerAdapter(MethodInvokeMeta methodInvokeMeta, CustomChannelInitializerClient channelInitializerClient) {
 this.methodInvokeMeta = methodInvokeMeta;
 this.channelInitializerClient = channelInitializerClient;
 }

 @Override
 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
 logger.info("客户端出异常了,异常信息:{}", cause.getMessage());
 cause.printStackTrace();
 ctx.close();
 }

 @Override
 public void channelActive(ChannelHandlerContext ctx) throws Exception {
 if (methodInvokeMeta.getMethodName().endsWith("toString") && !"class java.lang.String".equals(methodInvokeMeta.getReturnType().toString()))
  logger.info("客户端发送信息参数:{},信息返回值类型：{}", methodInvokeMeta.getArgs(), methodInvokeMeta.getReturnType());
 ctx.writeAndFlush(methodInvokeMeta);

 }

 @Override
 public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
 channelInitializerClient.setResponse(msg);
 }
}

CustomChannelInitializerClient.java

import com.edu.hart.rpc.entity.MethodInvokeMeta;
import com.edu.hart.rpc.entity.NullWritable;
import com.edu.hart.rpc.util.ObjectCodec;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/** 
Created by 叶云轩 on 2017/6/16-15:01 
Concat tdg_yyx@foxmail.com
*/
public class CustomChannelInitializerClient extends ChannelInitializer { 
 private Logger logger = LoggerFactory.getLogger(CustomChannelInitializerClient.class);

 private MethodInvokeMeta methodInvokeMeta;

 private Object response;

 public CustomChannelInitializerClient(MethodInvokeMeta methodInvokeMeta) {
 if (!"toString".equals(methodInvokeMeta.getMethodName())) {
  logger.info("[CustomChannelInitializerClient] 调用方法名：{}，入参：{},参数类型：{}，返回值类型{}"
   , methodInvokeMeta.getMethodName()
   , methodInvokeMeta.getArgs()
   , methodInvokeMeta.getParameterTypes()
   , methodInvokeMeta.getReturnType());
 }
 this.methodInvokeMeta = methodInvokeMeta;
 }

 public Object getResponse() {
 if (response instanceof NullWritable) {
  return null;
 }
 return response;
 }

 public void setResponse(Object response) {
 this.response = response;
 }

 @Override
 protected void initChannel(SocketChannel ch) {
 ChannelPipeline pipeline = ch.pipeline();
 pipeline.addLast(new LengthFieldPrepender(2));
 pipeline.addLast(new LengthFieldBasedFrameDecoder(1024 * 1024, 0, 2, 0, 2));
 pipeline.addLast(new ObjectCodec());
 pipeline.addLast(new ClientChannelHandlerAdapter(methodInvokeMeta, this));
 }}

4. RPCProxyFactoryBean.java

import com.edu.hart.rpc.entity.MethodInvokeMeta;
import com.edu.hart.rpc.util.WrapMethodUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.AbstractFactoryBean;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
* Created by 叶云轩 on 2017/6/16-17:16
* Concat tdg_yyx@foxmail.com
*/
public class RPCProxyFactoryBean extends AbstractFactoryBean implements InvocationHandler {
private Logger logger = LoggerFactory.getLogger(RPCProxyFactoryBean.class);
 private Class interfaceClass;

 private NettyClient nettyClient;

 @Override
 public Class<?> getObjectType() {
 return interfaceClass;
 }

 @Override
 protected Object createInstance() throws Exception {
 logger.info("[代理工厂] 初始化代理Bean : {}", interfaceClass);
 return Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass}, this);
 }

 @Override
 public Object invoke(Object proxy, Method method, Object[] args) {
 final MethodInvokeMeta methodInvokeMeta = WrapMethodUtils.readMethod(interfaceClass, method, args);
 if (!methodInvokeMeta.getMethodName().equals("toString")) {
  logger.info("[invoke] 调用接口{},调用方法名：{}，入参：{},参数类型：{}，返回值类型{}",
   methodInvokeMeta.getInterfaceClass(), methodInvokeMeta.getMethodName()
   , methodInvokeMeta.getArgs(), methodInvokeMeta.getParameterTypes(), methodInvokeMeta.getReturnType());
 }
 return nettyClient.remoteCall(methodInvokeMeta, 0);
 }

 public void setInterfaceClass(Class interfaceClass) {
 this.interfaceClass = interfaceClass;
 }

 public void setNettyClient(NettyClient nettyClient) {
 this.nettyClient = nettyClient;
 }
}

至此，netty-client与SpringBoot的集成了算完毕了。同样 ，在netty-client中也要加入相应的依赖

不过上面server与client使用了一些公共的类和工具。下面也给列举中出来。

MethodInvokeMeta.java

import org.springframework.stereotype.Component;

import java.io.Serializable;

/**
* 记录调用方法的元信息
* Created by 叶云轩 on 2017/6/7-15:41
* Concat tdg_yyx@foxmail.com
*/
@Component
public class MethodInvokeMeta implements Serializable {

 private static final long serialVersionUID = 8379109667714148890L;
 //接口
 private Class<?> interfaceClass;
 //方法名
 private String methodName;
 //参数
 private Object[] args;
 //返回值类型
 private Class<?> returnType;
 //参数类型
 private Class<?>[] parameterTypes;

 public Object[] getArgs() {
 return args;
 }

 public void setArgs(Object[] args) {
 this.args = args;
 }

 public Class<?> getInterfaceClass() {
 return interfaceClass;
 }

 public void setInterfaceClass(Class<?> interfaceClass) {
 this.interfaceClass = interfaceClass;
 }

 public String getMethodName() {
 return methodName;
 }

 public void setMethodName(String methodName) {
 this.methodName = methodName;
 }

 public Class[] getParameterTypes() {
 return parameterTypes;
 }

 public void setParameterTypes(Class<?>[] parameterTypes) {
 this.parameterTypes = parameterTypes;
 }

 public Class getReturnType() {
 return returnType;
 }

 public void setReturnType(Class returnType) {
 this.returnType = returnType;
 }
}

NullWritable.java

import java.io.Serializable;

/**
* 服务器可能返回空的处理
* Created by 叶云轩 on 2017/6/16-16:46
* Concat tdg_yyx@foxmail.com
*/
public class NullWritable implements Serializable {

 private static final long serialVersionUID = -8191640400484155111L;
 private static NullWritable instance = new NullWritable();

 private NullWritable() {
 }

 public static NullWritable nullWritable() {
 return instance;
 }
}

ObjectCodec.java

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageCodec;

import java.util.List;

public class ObjectCodec extends MessageToMessageCodec {

 @Override
 protected void encode(ChannelHandlerContext ctx, Object msg, List out) {
 byte[] data = ObjectSerializerUtils.serilizer(msg);
 ByteBuf buf = Unpooled.buffer();
 buf.writeBytes(data);
 out.add(buf);
 }

 @Override
 protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List out) {
 byte[] bytes = new byte[msg.readableBytes()];
 msg.readBytes(bytes);
 Object deSerilizer = ObjectSerializerUtils.deSerilizer(bytes);
 out.add(deSerilizer);
 }
}
ObjectSerializerUtils.java
package com.edu.hart.rpc.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;

/**
* 对象序列化工具
*/
public class ObjectSerializerUtils {

 private static final Logger logger = LoggerFactory.getLogger(ObjectSerializerUtils.class);

 /**
 * 反序列化
 *
 * @param data
 * @return
 */
 public static Object deSerilizer(byte[] data) {
 if (data != null && data.length > 0) {
  try {
  ByteArrayInputStream bis = new ByteArrayInputStream(data);
  ObjectInputStream ois = new ObjectInputStream(bis);
  return ois.readObject();
  } catch (Exception e) {
  logger.info("[异常信息] {}", e.getMessage());
  e.printStackTrace();
  }
  return null;
 } else {
  logger.info("[反序列化] 入参为空");
  return null;
 }
 }

 /**
 * 序列化对象
 *
 * @param obj
 * @return
 */
 public static byte[] serilizer(Object obj) {
 if (obj != null) {
  try {
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  ObjectOutputStream oos = new ObjectOutputStream(bos);
  oos.writeObject(obj);
  oos.flush();
  oos.close();
  return bos.toByteArray();
  } catch (IOException e) {
  e.printStackTrace();
  }
  return null;
 } else {
  return null;
 }
 }
}
下面主要是用于Client端的：
NettyBeanSacnner.java
import com.edu.hart.rpc.client.RPCProxyFactoryBean;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;

import java.util.List;

/**
* 动态加载代理bean到Spring bean工厂
*/
public class NettyBeanScanner implements BeanFactoryPostProcessor {

 private DefaultListableBeanFactory beanFactory;

 private String basePackage;

 private String clientName;

 public NettyBeanScanner(String basePackage, String clientName) {
 this.basePackage = basePackage;
 this.clientName = clientName;
 }


 /**
 * 注册Bean到Spring的bean工厂
 */
 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
 this.beanFactory = (DefaultListableBeanFactory) beanFactory;
 // 加载远程服务的接口
 List resolverClass = PackageClassUtils.resolver(basePackage);
 for (String clazz : resolverClass) {
  String simpleName;
  if (clazz.lastIndexOf('.') != -1) {
  simpleName = clazz.substring(clazz.lastIndexOf('.') + 1);
  } else {
  simpleName = clazz;
  }
  BeanDefinitionBuilder gd = BeanDefinitionBuilder.genericBeanDefinition(RPCProxyFactoryBean.class);
  gd.addPropertyValue("interfaceClass", clazz);
  gd.addPropertyReference("nettyClient", clientName);
  this.beanFactory.registerBeanDefinition(simpleName, gd.getRawBeanDefinition());
 }
 }
}
PackageClassUtils.java
这个类要说一下，主要是用来加载Server对应的接口的。因为在Client中RPC接口没有实现类，所以要自己将这些接口加载到Spring工厂里面。但是现在有个问题就是需要使用**
SpringBoot中application.yml
basePackage: com.edu.hart.rpc.service.login;com.edu.hart.rpc.service.employee;com.edu.hart.rpc.service.authorization;

这样的方式来加载，使用通配符的时候会加载不到，这个问题我还没有解决。**
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
* 字节文件加载
*/
public class PackageClassUtils {

 private final static Logger LOGGER = LoggerFactory.getLogger(PackageClassUtils.class);

 /**
 * 解析包参数
 *
 * @param basePackage 包名
 * @return 包名字符串集合
 */
 public static List resolver(String basePackage) {
 //以";"分割开多个包名
 String[] splitFHs = basePackage.split(";");
 List classStrs = new ArrayList<>();
 //s: com.yyx.util.*
 for (String s : splitFHs) {
  LOGGER.info("[加载类目录] {}", s);
  //路径中是否存在".*" com.yyx.util.*
  boolean contains = s.contains(".*");
  if (contains) {
  //截断星号 com.yyx.util
  String filePathStr = s.substring(0, s.lastIndexOf(".*"));
  //组装路径 com/yyx/util
  String filePath = filePathStr.replaceAll("\\.", "/");
  //获取路径 xxx/classes/com/yyx/util
  File file = new File(PackageClassUtils.class.getResource("/").getPath() + "/" + filePath);
  //获取目录下获取文件
  getAllFile(filePathStr, file, classStrs);
  } else {
  String filePath = s.replaceAll("\\.", "/");
  File file = new File(PackageClassUtils.class.getResource("/").getPath() + "/" + filePath);
  classStrs = getClassReferenceList(classStrs, file, s);
  }
 }
 return classStrs;
 }

 /**
 * 添加全限定类名到集合
 *
 * @param classStrs 集合
 * @return 类名集合
 */
 private static List getClassReferenceList(List classStrs, File file, String s) {
 File[] listFiles = file.listFiles();
 if (listFiles != null && listFiles.length != 0) {
  for (File file2 : listFiles) {
  if (file2.isFile()) {
   String name = file2.getName();
   String fileName = s + "." + name.substring(0, name.lastIndexOf('.'));
   LOGGER.info("[加载完成] 类文件：{}", fileName);
   classStrs.add(fileName);
  }
  }
 }
 return classStrs;
 }


 /**
 * 获取一个目录下的所有文件
 *
 * @param s
 * @param file
 * @param classStrs
 */
 private static void getAllFile(String s, File file, List classStrs) {
 if (file.isDirectory()) {
  File[] files = file.listFiles();
  if (files != null)
  for (File file1 : files) {
   getAllFile(s, file1, classStrs);
  }
 } else {
  String path = file.getPath();
  String cleanPath = path.replaceAll("/", ".");
  String fileName = cleanPath.substring(cleanPath.indexOf(s), cleanPath.length());
  LOGGER.info("[加载完成] 类文件：{}", fileName);
  classStrs.add(fileName);
 }
 }
}
RemoteMethodInvokeUtil.java
import com.edu.hart.rpc.entity.MethodInvokeMeta;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
* 消息处理类
* Created by 叶云轩 on 2017/6/7-15:49
* Concat tdg_yyx@foxmail.com
*/
public class RemoteMethodInvokeUtil implements ApplicationContextAware {

 private ApplicationContext applicationContext;

 public Object processMethod(MethodInvokeMeta methodInvokeMeta) throws InvocationTargetException, IllegalAccessException {
 Class interfaceClass = methodInvokeMeta.getInterfaceClass();
 Object bean = applicationContext.getBean(interfaceClass);
 Method[] declaredMethods = interfaceClass.getDeclaredMethods();
 Method method = null;
 for (Method declaredMethod : declaredMethods) {
  if (methodInvokeMeta.getMethodName().equals(declaredMethod.getName())) {
  method = declaredMethod;
  }
 }
 Object invoke = method.invoke(bean, methodInvokeMeta.getArgs());
 return invoke;
 }

 @Override
 public void setApplicationContext(ApplicationContext app) throws BeansException {
 applicationContext = app;
 }
}
WrapMethodUtils.java
import com.edu.hart.rpc.entity.MethodInvokeMeta;

import java.lang.reflect.Method;

public class WrapMethodUtils {
/**
* 获取 method的元数据信息

@param interfaceClass
* @param method
* @param args
* @return
*/
public static MethodInvokeMeta readMethod(Class interfaceClass, Method method, Object[] args) {
MethodInvokeMeta mim = new MethodInvokeMeta();
mim.setInterfaceClass(interfaceClass);
mim.setArgs(args);
mim.setMethodName(method.getName());
mim.setReturnType(method.getReturnType());
Class<?>[] parameterTypes = method.getParameterTypes();
mim.setParameterTypes(parameterTypes);
return mim;
}
}
下面的这些类我也会用在与前台通信时使用：
ResponseEnum.java
import java.io.Serializable;

/**

响应码枚举类
Created by 叶云轩 on 2017/6/13-11:53
Concat tdg_yyx@foxmail.com
*/
public enum ResponseCodeEnum implements Serializable {

// region authentication code
REQUEST_SUCCESS(10000, "请求成功"),
SERVER_ERROR(99999, "服务器内部错误"),;

//region 提供对外访问的方法,无需更改
/**
响应码
*/
private Integer code;
/**
响应信息
*/
private String msg;
ResponseCodeEnum(Integer code, String msg) {
this.code = code;
this.msg = msg;
}

public Integer getCode() {
return code;
}

public String getMsg() {
return msg;
}

//endregion
}


ResponseResult.java
import java.io.Serializable;

/**
 * 数据返回实体封装
 * 

 * Created by 叶云轩 on 2017/6/13-11:38
 * Concat tdg_yyx@foxmail.com
 *
 * @param  通用变量
 */
public class ResponseResult implements Serializable {


 private static final long serialVersionUID = -3411174924856108156L;
 /**
 * 服务器响应码
 */
 private Integer code;
 /**
 * 服务器响应说明
 */
 private String msg;
 /**
 * 服务器响应数据
 */
 private T data;

 public ResponseResult() {

 }

 @Override
 public boolean equals(Object o) {
 if (this == o) return true;
 if (o == null || getClass() != o.getClass()) return false;

 ResponseResult<?> that = (ResponseResult<?>) o;

 return (code != null ? code.equals(that.code) : that.code == null) && (msg != null ? msg.equals(that.msg) : that.msg == null) && (data != null ? data.equals(that.data) : that.data == null);
 }

 public Integer getCode() {

 return code;
 }

 public void setCode(Integer code) {
 this.code = code;
 }

 public T getData() {
 return data;
 }

 public void setData(T data) {
 this.data = data;
 }

 public String getMsg() {
 return msg;
 }

 public void setMsg(String msg) {
 this.msg = msg;
 }

 @Override
 public int hashCode() {
 int result = code != null ? code.hashCode() : 0;
 result = 31 * result
  + (msg != null ? msg.hashCode() : 0);
 result = 31 * result + (data != null ? data.hashCode() : 0);
 return result;
 }

 @Override
 public String toString() {
 return "ResponseResult{"
  + "code="
  + code
  + ", msg='"
  + msg
  + '\''
  + ", data="
  + data
  + '}';
 }
}


ResponseResultUtil.java
import com.edu.hart.modules.communicate.ResponseCodeEnum;
import com.edu.hart.modules.communicate.ResponseResult;

/**
 * 返回结果工具类
 * Created by 叶云轩 on 2017/5/29-10:37
 * Concat tdg_yyx@foxmail.com
 */
public class ResponseResultUtil {

 /**
 * 请求失败返回的数据结构
 *
 * @param responseCodeEnum 返回信息枚举类
 * @return 结果集
 */
 public static ResponseResult error(ResponseCodeEnum responseCodeEnum) {
 ResponseResult ResponseResult = new ResponseResult();
 ResponseResult.setMsg(responseCodeEnum.getMsg());
 ResponseResult.setCode(responseCodeEnum.getCode());
 ResponseResult.setData(null);
 return ResponseResult;
 }

 /**
 * 没有结果集的返回数据结构
 *
 * @return 结果集
 */
 public static ResponseResult success() {
 return success(null);
 }

 /**
 * 成功返回数据结构
 *
 * @param o 返回数据对象
 * @return 返回结果集
 */
 public static ResponseResult success(Object o) {
 ResponseResult responseResult = new ResponseResult();
 responseResult.setMsg(ResponseCodeEnum.REQUEST_SUCCESS.getMsg());
 responseResult.setCode(ResponseCodeEnum.REQUEST_SUCCESS.getCode());
 responseResult.setData(o);
 return responseResult;
 }

 /**
 * 判断是否成功
 *
 * @param responseResult 请求结果
 * @return 判断结果
 */
 public static boolean judgementSuccess(ResponseResult responseResult) {
 return responseResult.getCode().equals(ResponseCodeEnum.REQUEST_SUCCESS.getCode());
 }
}


来，我们测试一下远程通信：
Client调用Server的一个接口。可以看到在hart-oa项目中，RPCEmployeeService没有任何实现类，控制台中打印了方法的调用 以及入参信息
Netty与Spring Boot的整合实现
Server断点监听到远程调用，CloudApplication项目为Server端，我们可以看到接收到来自hart-oa的一个请求，参数一致。在CloudApplication中进行相应的处理后，返回到Client(hart-oa)
Netty与Spring Boot的整合实现
返回信息到Client，可以看到我们（hart-oa）收到了来自CloudApplication的响应，结果是我们封装好的ResponseResult.
Netty与Spring Boot的整合实现
嗯 ～至此整合测试完成。 
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
            
            
                            

                网站栏目：Netty与SpringBoot的整合实现                

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